<template>
    <div class="list" ref="wrapper">
       <div>
      <div class="area">
          <div class="title border-topbottom">当前城市</div>
          <div class="button-list">
            <div class="button-wrapper">
              <div class="button">{{this.currentCity}}</div>
            </div>
          </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hot"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div
        class="area"
        v-for="(item, key) of cities"
        :key="key"
        :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
    </div>
</template>

<script>
    import Bscroll from 'better-scroll'
    import { mapState, mapMutations } from 'vuex'
    export default {
        name: "CityList",
        props: {
            hot: Array,
            cities: Object,
            letter: String

        },
        computed: {
          ...mapState({
             currentCity: 'city'  // 把vuex里面的city公用的数据映射到这个组件的计算属性里面，映射过来的名字叫currentCity
          })
        },
        methods: {
           handleCityClick (city) {
            //this.$store.dispatch('changeCity',city);
            //this.$store.commit('changeCity',city);
            this.changeCity(city);
            //alert(city);
            this.$router.push('/');  // 跳转到首页,编程式导航
           },
           ...mapMutations(['changeCity'])
        },
        mounted () {
          this.scroll = new Bscroll(this.$refs.wrapper);  
        },
        watch: {
          letter () {
            if(this.letter){
              const element = this.$refs[this.letter][0];
              // console.log(element);
              this.scroll.scrollToElement(element);
            }
            console.log(this.letter);
          }
        }
    }

</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem

</style>
